Grate-bar.



G. S. CARRICK.

GRATE BAR.

APPLICATION flLED' JULY 6. 1915.

Patented Mar. 6. 1917.

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GRATE-BAR.

Application filed July 6, 1915. Serial No. 38,255.

To all whom it may concern:

Be it known that I, GERALD S. OARRICK, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Grate-Bars, of whichthe following is a specification.

My invention relates to that class of grates in which a forced draft isused, and is designed as an improvement on grates of this class whileutilizing the principal features thereof, and is designed to avoid theuse of the filler which is sometimes employed intermediate the gratebars. This filler has two objectionable features, primarily that it isvery expensive to put in, another that if the grate bars expand, owingto the heat, they are liable to bulge the side walls of the furnace.

My invention has for its object to pro vide an improved form of gratebar which will avoid the necessity of using the filler, and which willpermit the bars to expand without doing any damage to the inclosingstructure, and while primarily intended to present a tight surface, areso arranged that should they become slightly separated, the shape of thebars would be such as would serve to avoid any deleterious result.

My means of accomplishing the foregoing objectsmay be more readilyunderstood by having reference to' the accompanying drawings which arehereunto annexed and are a part of this specification, in which:

Figure 1 is a fragmentary view of the top of two of my grate bars.

Fig. 2 is a side elevation of the same.

Fig. 3 is a cross section taken on the line w-az in Fig. 1.

Similar reference numerals refer to similar parts throughout the entiredescription.

As shown in the drawings, the grate bars are provided with top walls 1,and side walls 2 and 3, the lower portion of which tapers inwardly andterminates in a longitudinal flange 4:. In my bar the vertical portionof the side wall 2, adjacent the top wall 1 is beveled as at 5, whilethe corresponding portion of the side wall 3, is provided with anangular outwardly extended portion 6, the angle of the lower surface 7of the angular portion 6, being preferably of lesser degree than theangle of the bev-' eled surface 5.

Specification of Letters Patent.

Patented Mar. 6, 1917.

terious effect upon the fire, inasmuch as the inclined walls will serveto direct the air in an oblique line of travel through the fire, therebyattaining a somewhat similar effect to that produced by the shape of thearcuate slots in the top of the wall 1, shown in the drawings.

The result of this construction is as follows:

l/Vhen the bars are installed in the furnace, they are fitted in so thatthe point of the angularly extended portion 6, contacts with the pointof union of the beveled portion 5, with the surface of the top wall 1,there being a space intermediate the two inclined surfaces and thevertical portion of the walls 2 and 3.

It will be apparent from the foregoing description that when the fire iskindled in the fire-box and the bars expand due to the heat, that thepoint of the angularly extended portion will slip past the point ofunion of the beveled portion 5, with the surface of the top wall 1, asindicated by the dotted lines, without doing the slightest damage to theretaining walls of the furnace. At the same time, .it will be' apparentthatthe necessity for the filler between the walls 2 and 3, is entirelyobviated and all the trouble and expense connected with thisinstallation is done away with without sacrificing any of the efliciencyof the furnace. This also provides a larger cooling surface whichlengthens the life of the grate bar, as it keeps them much cooler thancan be done when the filler is employed.

Having described my invention what I regard as new, and desire to secureby Letters Patent is:

1. In a forced draft furnace, a plurality of hollow grate bars, havingtop, end and side walls, the upper portion of one of the side walls,adjacent the top wall, being'beveled, a corresponding portion of the 10which is inclined.

3. A hollow grate bar for forced draft furnaces, with top, end and sidewalls, one side wall having an inclined portion adjacent the top wall,the other side wall having an outwardly extended portion, having 15 aninclined lower surface of a different angle than the beveled portion.

In testimony whereof, I have signed the foregoing specification.

GERALD S. CARRIGK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, 11.0.

